The supporting character's harem is very normal - Chapter 269 You are very lucky to meet me.

In Academy City, magic and science coexist in an unwavering power struggle. Toma Kamijo, an academically-challenged student in Academy City, wields the power of the Imagine Breaker in his right hand, which allows him to completely negate all supernatural powers – as well as his own luck. When he happens upon a mysterious nun named Index, whose mind has been implanted with the Index Librorum Prohibitorum – 103,000 ancient texts banned by the Church – Toma’s luck is about to be pushed to its limits when he finds himself in the middle of a war he never expected!

Teela married King Heavenly because she loved him, but life in the Heavenly household was anything but euphoric. Lettie, her hard-as-nails mother-in-law, treats her like an unpaid servant. The family treats her like an outsider. King treats her like a shadow, transparent and forgettable.When Lettie presses Teela to prove her value to the family or get out, Teela has a decision to make. But she’s not leaving without a fight.King Heavenly rules Heavenly Industries with an iron fist, but he leaves his home life to his mother to manage, and that includes the management of his boring little wife. Teela has never complained. She’s never done anything interesting, for that matter. She’s just one more responsibility in a long line of responsibilities that King shoulders on a daily basis, and that is exactly how he treats her — as a responsibility that he’s delegated to his mother.Suddenly Teela steps out of the shadows and into a fight with him and his whole family, and King is baffled by the ruthless actions of his now daring wife. He’d always heard that vengeance is a dish best served cold, but Teela is coming in hot!

The way of a Demon Lord - since the beginning of time, countless demons dreamt of it but few dared to tread on it, and even fewer reached its end. But the rarest of them all were some special demons who were not allowed to step on it, because if they were to become a Demon Lord- even the other lords would have to bow their heads. Abhorred and hunted by all, they could not do anything but hide till their lifespans came to an end. But for the first time ever, one such demon chose to do otherwise.

Follow Adrian Darkheart as he uses his special demonic power, superior intellect and innate brutality to walk the path of chaos and destruction and become the greatest Demon Lord ever.

Warning: The story is exceedingly dark and contains explicit mature and gore scenes.

An ordinary student accidentally traveled into an other universe and became the king of a small kingdom. He had gotten a “Cheating Code” of life and was able to complete something extraordinary. This is the story about a king that was able to conquer continents and leave behind him an ultimate legend that will be recited between every generation to come.

- Description from novelupdates